By definition, a "Cataplana" is a seafood dish!
Consequently, it is highly likely that ANY cataplana, even those described as meat based, will include some form of sea-food, be it fish, cephalapod or mollusc.
I had this yesterday in Alvor, when a member of the party wanted a cataplana without molluscs. She chose one which said "mixed fish", but when it appeared it was full of "items of wobbly nature" as well!
There is such a thing as chicken cataplana but usually it calls for clams as well!
However, if you want to do it yourself, here's a couple of recipes (in Portuguese) I found for it on the Portuguese web!!